SpringBoot学习(1)

package com.study.spring_boot_log;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration;
import org.springframework.context.ConfigurableApplicationContext;

import com.study.spring_boot_log.dao.UserDao;
import com.study.spring_boot_log.service.UserService;
@SpringBootApplication(exclude=WebSocketAutoConfiguration.class)
public class App {
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(App.class,args);
        context.getBean(UserDao.class).log();
        System.out.println("===================");
        context.getBean(UserService.class).log();
        
        context.close();
    }
}

 pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.study.springboot</groupId>
    <artifactId>spring-boot-log</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <name>spring-boot-log</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.5.3.RELEASE</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>        
    </dependencies>
</project>

package com.study.spring_boot_log.dao;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class UserDao {
    private Logger log = LoggerFactory.getLogger(UserDao.class);
    public void log() {
        log.debug("user dao debug log");
        log.info("user dao info log");
        log.warn("user dao warn log");
        log.error("user dao error log");
    }
}

package com.study.spring_boot_log.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class UserService {
    private Logger log = LoggerFactory.getLogger(UserService.class);
    public void log() {
        log.debug("user service debug log");
        log.info("user service info log");
        log.warn("user service warn log");
        log.error("user service error log");
    }
}

springboot默认 的日志级别是info
可以通过logging.level.*=debug配置项设置，*可以是包，也可以是某个类。

也可以在Run Configurations中配置 --debug，或者SpringApplication.run(App.class,“--debug=true”)。这两种debug只会是springboot默认，自定义的类不会debug。

日志级别有：TRACE,DEBUG,INFO,WARN,ERROR,FATA,OFF
日志级别配置成OFF，表示关闭日志输出

logging.file 指定日志文件路径名字
logging.path 指定日志目录(此时的日志名字为spring.log)
日志文件输出，文件的大小10M之后，就会分割

logging.pattern.console 配置控制台输出日志的pattern
logging.file.console 配置日志文件输出日志的pattern

application.properties

logging.level.com.study.spring_boot_log.dao.UserDao=off
logging.level.com.study.spring_boot_log.service.UserService=DEBUG

logging.file=D:/ivy/mylog
logging.path=D:/ivy/mylogs

logging.pattern.console=%-20(%d{yyyy-MM-dd} [%thread]) %-5level %logger{80} - %msg%n
logging.file.console=%-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80} - %msg%n

springboot 默认支持logback
也就是说，只需要在classpath下放一个logback.xml，logback-spring.xml的文件，即可定制日志的输出

logback-spring.xml或logback.xml：

<?xml version="1.0" encoding="UTF-8"?>  
<configuration>  
  <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender">  
    <layout class="ch.qos.logback.classic.PatternLayout">  
      <pattern>%-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80} - %msg%n</pattern>  
    </layout>  
  </appender>  
  
  
  <root level="debug">  
    <appender-ref ref="consoleLog" />  
  </root>  
</configuration>

使用其他的日志组件的步骤：
1.排除默认的日志组件：spring-boot-starter-logging
2.加入新的日志路径依赖
3.把相应的配置文件放在classpath下

log4j2.xml：

<?xml version="1.0" encoding="UTF-8"?>  
<configuration>
    <appenders>  
        <Console name="console" target="SYSTEM_OUT" follow="true">  
          <PatternLayout pattern="%d{yyyy-MM-dd} [%thread] %-5level %logger{80} - %msg%n"/>  
        </Console> 
   </appenders>
   <loggers>  
    <root level="DEBUG">  
      <appender-ref ref="console"/> 
    </root>  
  </loggers> 
</configuration>